This strut is tracked by the flow and by the rootbox.
<rdar://problem/30659469>
Created attachment 302430 [details] Patch
Created attachment 302434 [details] Patch
Comment on attachment 302434 [details] Patch Clearing flags on attachment: 302434 Committed r212854: <http://trac.webkit.org/changeset/212854>
All reviewed patches have been landed. Closing bug.